User:Najro

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This is the timeline of the 3 longest supported deck arch bridges spans in the world, where the road deck lies on top of the arch. The deck is supported by columns, truss, rubble or lies directly on the arch. These bridges are often found in narrow valleys. Because of the difficulty in telling an arch bridge apart from a bent beam bridge or certain cantilever bridges, all bridges that look like supported deck arch bridges are included in this timeline. The whole arch should be visible uninterrupted by other structures such as the deck. Suspended deck arch bridges are excluded. The lower deck of the Eads Bridge is suspended a bit, but not below the underside of the arch, and the upper deck is completely above of the arch, so Eads is included, as is Colossus Bridge. The lower deck of Dom Luís Bridge, Porto is suspended as far as is possible so it is excluded.

In this timeline, only spans that were still standing a particular year are considered for that year. This is perhaps more fair than a timeline of the records of all time, because the old figures might be incorrect. At the points when the old spans falls, new spans with more certain figures are allowed to appear in the timeline. This is the historic top 3 lists of standing longest spans per day.

When several bridges of the same length exists, the oldest is counted as the longest.

Note: Some information in this timeline have uncertainty, especially before 1874.

1 Longest Spans 1796 - present
2 Longest Spans 142 BC - 1796
3 Known incorrect construction years
4 External links
5 See also
6
7 References
8 See also
9 External links

[edit] Longest Spans 1796 - present

[edit] Longest Spans 142 BC - 1796

[edit] Known incorrect construction years

In this table the finishing years of construction of the structures shown in the timeline, that are known to be incorrect, are listed. If a guess was not made for the years of construction that are unknown, the graphical timeline could not be drawn. Some timber arches are probably missing from the timeline in the 19th century.

Incorrect year	Bridge
1936	192m Rio Esla Bridge, Spain, Brückenweb. Uncertain if this bridge exists or identical to Martín Gil Viaduct 209 m.

[edit] External links

covered wooden bridges? colossus have to look like arch

Grubenmann Limmat??

[edit] See also

List of largest ceiling spans

The Akashi-Kaikyo Bridge has the largest span of any bridge

See Wikipedia_talk:Featured_lists#Proposed_change_to_all_featured_lists for an explanation of this and other inclusion tags below

This list contains the largest ceiling spans in the world, that at least have the strength to support some persons. It is decided that roofs made of canvas etc do not have that strenght. There must be no supporting pillars in that part of the ceiling constituting the span.

The span of a square room is equal to the length of a side of the room. The span of a rectangular room is equal to the shortest side of the room. The free span of any room is calculated like this: Place the largest possible imaginary horisontal circular disk inside the room, barely touching any load-bearing pillars or walls, or parts used to stabilize the roof. The disk must also not encircle any objects of this kind. The disk have to be completely covered, that is rain-sheltered, by the building. The span of the room is equal to diameter of the disk.

pillars... diagonal...

Example: The O2 (former Millennium Dome) has an overall diameter of 365 m. But it has a jagged edge so an imaginary disk of this diameter would not be rain-sheltered. When the disk is shrunk to O2's internal diameter 320 m it become rain-sheltered by the structure, but this is still not the free ceiling span because the disk is encircling the twelve load-bearing pillars located under the roof. When the disk is further shrunk to 206 m it is only slightly touching the innermost side of the pillars, so this is finally the clear ceiling span of O2. Note that since the pillars are lending outwards, the largest span is not found at the floor level, but some metres up the pillars until were a wire is connected that stabilizes the roof. A disk of this size is encircling a lot of non-load-bearing walls of O2, for example the walls of the O2 Arena which has it's own roof. Since the O2 Arena structure is not supporting the O2 structure, that doesn't matter.

[edit]

Note: Click on each bridge's rank to go to the bridge's official web-site. Ranks with a red asterisk (*) do not have official web-sites, or do not have English language versions and are linked instead to a reference entry.

The indoor photo shows the room and the ceiling "prooving" there are no supporting pillars.

Indoor photo	Rank	Name	Location	Land	Ceiling span in metres (feet)	Year opened
Linked photo		Ōita Stadium	Ōita, Ōita	&Japan	&0000000000000245.000000245 (803 ft)	2001
		Nantong Sports Centre	Nantong	&China	&0000000000000240.000000240 (787)	2006
		Reliant Stadium	Houston	&USA	&0000000000000224.000000224 (734 ft)	2002
		Seibu Dome	Saitama	&Japan	&0000000000000220.000000220 (721)	1999
		Sapporo Dome	Sapporo	&Japan	&0000000000000218.000000218 (715)	2001
		Sapporo Dome	Sapporo	&Japan	&0000000000002180.0000002,180 2,180 m (7,152 ft)	2001
		Sapporo Dome	Sapporo	&Japan	&0000000000000021.00000021 21 m (69 ft)	2001
Linked photo	[1]	The_O2	London	&UK	&0000000000000206.000000206 (675)	2000